Winston classified the energy that the following objects possess into 3 groups: Group 1, Group 2 and Group 3. There are 2 objects in each group.

Group 1
  • battery
  • chocolate bar
Group 2
  • compressed spring in a toy
  • stretched rubber band in a catapult
Group 3
  • moving water in a river
  • rolling ball moving on a flat ground

Which one of the following correctly represents the most likely headings for groups 1, 2 and 3?

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